This is an emulsion of Mineral Oil used as a vehicle for injected antigens, thus increasing the stimulus to immunity. As an adjective, "adjuvant" is used in medicine to describe es- pecially chemotherapy or radiotherapy in- voked as a supplement to another mode of cancer treatment, usually surgery. Adjuvant therapy can be applied before or after opera- tion. In both cases, the word is a near borrow- ing of the Latin adjuvans, adjuvant (the present participle of adjuvare, "to help"), especially in the sense of attaining a goal.